A method for evaluating the feasibility of seawater cleaning an engine

Abstract

This invention relates to the field of turboshaft engine testing technology, specifically proposing a feasibility assessment method for seawater cleaning of the engine. The method includes the following steps: obtaining the standard cleaning efficiency, standard performance benchmark, preset cleaning flow rate, and preset cleaning time of the engine body; based on the preset cleaning flow rate and preset cleaning time, obtaining the cold cleaning efficiency and cold cleaning performance benchmark of the engine blades through cold cleaning, and obtaining the hot cleaning efficiency and hot cleaning performance benchmark of the engine blades through hot cleaning; and obtaining the feasibility assessment result for seawater cleaning of the engine body based on the standard cleaning efficiency, standard performance benchmark, cold cleaning performance benchmark, hot cleaning performance benchmark, blade cold cleaning efficiency, and blade hot cleaning efficiency. This method allows maintenance personnel to understand the feasibility and specific cleaning conditions of using seawater to clean the engine body in advance, reducing uncertainty, lowering the probability of engine body failure and damage, and reducing maintenance and repair costs.

Description

Technical Field

[0001] This invention belongs to the field of turboshaft engine testing technology, and specifically relates to a feasibility assessment method for a seawater-cleaning engine. Background Technology

[0002] Turboshaft engines require periodic or customary cleaning of their flow channels during operation to restore normal performance by removing deposits of sand, dust, insects, grease, and other contaminants that adhere to the intake manifold and blades.

[0003] Existing turboshaft engines generally use purified water, distilled water, or other fresh water for cold or hot cleaning to remove dirt and grime. However, when turboshaft engines are used on islands or ships, fresh water resources are easily strained or even interrupted due to unforeseen circumstances. In such situations, to ensure the smooth operation of the turboshaft engine, seawater must be used for short-term emergency cold or hot cleaning as a backup measure. However, not all types of turboshaft engines can be cleaned with seawater. Some types can be cold cleaned with seawater but cannot be hot cleaned, and some types cannot be cleaned with seawater at all, as doing so would cause irreversible damage.

[0004] Therefore, before a turboshaft engine is officially put into service, maintenance personnel need to understand the feasibility and specific cleaning conditions of using seawater for cleaning. However, currently, there is a relative lack of methods to verify the feasibility of using seawater to clean turboshaft engines. In most cases, the feasibility of using seawater for cleaning can only be judged based on the experience of maintenance personnel, and the specific cleaning conditions can only be selected based on their experience. This introduces significant uncertainty, leading to a higher probability of turboshaft engine malfunctions or even damage due to seawater cleaning, greatly increasing maintenance and repair costs. Summary of the Invention

[0005] To address the above problems, this invention proposes a feasibility assessment method for seawater cleaning of engines, comprising the following steps:

[0006] Obtain the standard cleaning efficiency, standard performance benchmark, preset cleaning flow rate, and preset cleaning time of the engine body;

[0007] Based on the cold cleaning method, preset cleaning flow rate and preset cleaning time, a preset salt solution and a preset pure solution are sequentially introduced into the engine body to obtain the cold cleaning efficiency and cold cleaning performance benchmark of the engine body blades.

[0008] Based on the hot cleaning method, preset cleaning flow rate and preset cleaning time, a preset salt solution and a preset pure solution are sequentially introduced into the engine body to obtain the hot cleaning efficiency and hot cleaning performance benchmark of the engine body blades.

[0009] Based on standard cleaning efficiency, standard performance benchmark, cold cleaning performance benchmark, hot cleaning performance benchmark, blade cold cleaning efficiency, and blade hot cleaning efficiency, the feasibility assessment results of cleaning the engine body with seawater were obtained.

[0010] In some specific embodiments, obtaining the standard cleaning efficiency, standard performance benchmark, preset cleaning flow rate, and preset cleaning time of the engine body includes the following steps:

[0011] Based on the cold cleaning method, a preset pure solution is introduced into the engine body to obtain the standard cleaning efficiency and standard performance benchmark of the engine body;

[0012] Based on the thermal cleaning method, a preset pure solution is introduced into the engine body to obtain the preset cleaning flow rate and preset cleaning time of the engine body.

[0013] In some specific embodiments, the step of introducing a preset salt solution and a preset pure solution sequentially into the engine body based on a cold cleaning method, a preset cleaning flow rate, and a preset cleaning time to obtain the cold cleaning efficiency and cold cleaning performance benchmark of the engine body blades includes the following steps:

[0014] When the engine body is in a cold operating state, a preset salt solution is introduced into the engine body according to the preset cleaning flow rate and preset cleaning time to obtain the cold cleaning efficiency of the engine body blades.

[0015] After a preset settling time, the first cold cleaning performance benchmark of the engine body is obtained;

[0016] After the engine body cools down, a pre-set pure solution is introduced into the engine body to clean the engine body and obtain the second cold cleaning performance benchmark of the engine body.

[0017] In some specific embodiments, the step of sequentially introducing a preset salt solution and a preset pure solution into the engine body based on a thermal cleaning method, a preset cleaning flow rate, and a preset cleaning time to obtain the thermal cleaning efficiency and thermal cleaning performance benchmark of the engine body blades includes the following steps:

[0018] When the engine body is in a ground idle state, a preset salt solution is introduced into the engine body according to the preset cleaning flow rate and preset cleaning time to obtain the engine body blade thermal cleaning efficiency.

[0019] After a preset settling time, the first thermal cleaning performance benchmark of the engine body is obtained;

[0020] After the engine block cools down, a pre-set pure solution is introduced into the engine block to clean it and obtain the third cold cleaning performance benchmark of the engine block.

[0021] In some specific embodiments, the thermal cleaning method, after introducing a preset pure solution into the engine body and obtaining a preset cleaning flow rate and preset cleaning time for the engine body, includes the following steps:

[0022] Obtain the preset cleaning performance benchmark of the engine body.

[0023] In some specific embodiments, the feasibility assessment results for seawater cleaning of the engine body, based on standard cleaning efficiency, standard performance benchmarks, cold cleaning performance benchmarks, hot cleaning performance benchmarks, blade cold cleaning efficiency, and blade hot cleaning efficiency, include the following steps:

[0024] Based on the standard performance benchmark and the first cold cleaning performance benchmark, the first cold cleaning performance reduction of the engine body is obtained;

[0025] Based on the standard cleaning efficiency and the blade cold cleaning efficiency, the first cold cleaning efficiency reduction of the engine body is obtained;

[0026] Based on the first cold cleaning performance reduction and the first cold cleaning efficiency reduction, the feasibility assessment results of seawater cleaning of the engine body are obtained.

[0027] In some specific embodiments, the assessment results for obtaining the feasibility of cleaning the engine body with seawater based on standard cleaning efficiency, standard performance benchmark, cold cleaning performance benchmark, hot cleaning performance benchmark, blade cold cleaning efficiency, and blade hot cleaning efficiency further include the following steps:

[0028] Based on the standard performance benchmark and the first thermal cleaning performance benchmark, the first thermal cleaning performance reduction of the engine body is obtained;

[0029] Based on the standard cleaning efficiency and the blade thermal cleaning efficiency, the first thermal cleaning efficiency reduction of the engine body is obtained.

[0030] Based on the performance degradation and efficiency degradation of the first thermal cleaning, the feasibility assessment results of seawater cleaning of the engine body are obtained.

[0031] In some specific embodiments, after obtaining the feasibility assessment results of the seawater cold cleaning engine body based on the first cold cleaning performance reduction and the first cold cleaning efficiency reduction, the following steps are included:

[0032] Based on the standard performance benchmark and the second cold cleaning performance benchmark, the second cold cleaning performance reduction of the engine body is obtained;

[0033] Based on the performance degradation of the second cold cleaning, the feasibility assessment results of seawater cleaning of the engine body were obtained.

[0034] In some specific embodiments, after obtaining the feasibility assessment results of the seawater thermal cleaning engine body based on the first thermal cleaning performance degradation and the first thermal cleaning efficiency degradation, the following steps are included:

[0035] Based on the standard performance benchmark and the third cold cleaning performance benchmark, the reduction in the third cold cleaning performance of the engine body is obtained;

[0036] Based on the performance degradation of the third cold cleaning, the feasibility assessment results of seawater cleaning of the engine body were obtained.

[0037] In some specific embodiments, after obtaining the preset cleaning performance benchmark of the engine body, the following steps are included:

[0038] Based on standard performance benchmarks and preset cleaning performance benchmarks, a second thermal cleaning assessment result was obtained to determine the feasibility of cleaning the engine body with seawater.

[0039] Compared with existing technologies, the feasibility assessment method for seawater cleaning of engines of the present invention has at least the following advantages: By obtaining the cleaning efficiency and performance benchmarks of the engine body after cold cleaning and hot cleaning respectively, and combining them with the standard cleaning efficiency and standard performance benchmarks of the engine body, a feasibility assessment result regarding seawater cleaning of the engine body can be obtained. This allows maintenance personnel to understand the feasibility of using seawater to clean the engine body before it is put into use, based on the assessment result. Furthermore, if seawater cleaning is permissible, the specific cleaning conditions for using seawater can be further determined based on the assessment result. This facilitates judgment and selection by maintenance personnel, reduces uncertainty in the event of emergencies, lowers the probability of malfunctions or even damage caused by using seawater for cleaning, and reduces maintenance and repair costs.

[0040] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description and the drawings. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 A flowchart illustrating the feasibility assessment method for a seawater cleaning engine according to an embodiment of the present invention is shown. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] This invention provides a feasibility assessment method for seawater cleaning of an engine, comprising the following steps: obtaining the standard cleaning efficiency, standard performance benchmark, preset cleaning flow rate, and preset cleaning time of the engine body; based on the cold cleaning method, preset cleaning flow rate, and preset cleaning time, sequentially introducing a preset salt solution and a preset purified solution into the engine body to obtain the cold cleaning efficiency and cold cleaning performance benchmark of the engine blades; based on the hot cleaning method, preset cleaning flow rate, and preset cleaning time, sequentially introducing a preset salt solution and a preset purified solution into the engine body to obtain the hot cleaning efficiency and hot cleaning performance benchmark of the engine blades; and based on the standard cleaning efficiency, standard performance benchmark, cold cleaning performance benchmark, hot cleaning performance benchmark, cold cleaning efficiency of the blades, and hot cleaning efficiency of the blades, obtaining the feasibility assessment result for seawater cleaning of the engine body.

[0045] Specifically, first, the standard cleaning efficiency and standard performance benchmark for cleaning the engine block under normal conditions are obtained. The standard cleaning efficiency is the ratio of the cleaned area to the total area of ​​the engine block blades after cleaning under normal conditions. The standard performance benchmark consists of the performance parameters of the engine block after cleaning under normal conditions. Furthermore, the preset cleaning flow rate and preset cleaning time for cleaning the engine block under normal conditions need to be determined. The preset cleaning flow rate is the maximum acceptable cleaning flow rate for the engine block, and the preset cleaning time is the maximum acceptable cleaning time for the engine block. Then, after restoring the engine block to its operating state, a preset salt solution and a preset pure solution are introduced sequentially into the flow channels of the engine block using a cold cleaning method, according to the preset cleaning flow rate and preset cleaning time. This allows the cold cleaning efficiency and cold cleaning performance benchmark of the engine block blades to be obtained. The blade cold cleaning efficiency is the ratio of the cleaned area to the total area of ​​the engine block blades after cold cleaning with the preset salt solution and preset pure solution, and the cold cleaning performance benchmark consists of the performance parameters of the engine block after cold cleaning with the preset salt solution and preset pure solution. Then, the engine body is restored to its operating state. Through thermal cleaning, a preset salt solution and a preset pure solution are sequentially introduced into the flow channel of the engine body according to a preset cleaning flow rate and a preset cleaning time. This allows the engine body blade thermal cleaning efficiency and thermal cleaning performance benchmark to be obtained. The blade thermal cleaning efficiency is the ratio of the cleaned area to the total area of ​​the engine body blades after thermal cleaning with the preset salt solution and the preset pure solution. The thermal cleaning performance benchmark is the performance parameter of the engine body after thermal cleaning with the preset salt solution and the preset pure solution.

[0046] By obtaining the cold cleaning efficiency and cold cleaning performance benchmark of the blades after cold cleaning, and the hot cleaning efficiency and hot cleaning performance benchmark of the blades after hot cleaning, and combining them with the standard cleaning efficiency and standard performance benchmark of the engine body, an assessment result on the feasibility of cleaning the engine body with seawater can be obtained. This allows maintenance personnel to understand the feasibility of using seawater to clean the engine body before it is put into use, based on the assessment result.

[0047] Furthermore, if the engine block is permissible for seawater cleaning, this assessment result can further determine the specific cleaning conditions for using seawater for engine block cleaning. This facilitates judgment and selection by maintenance personnel, reduces uncertainty in the event of emergencies, lowers the probability of malfunctions or even damage caused by using seawater for cleaning, and reduces maintenance and repair costs.

[0048] It should be noted that cold cleaning typically refers to cleaning the engine block by introducing a solution when the engine is running at room temperature, while hot cleaning typically refers to cleaning the engine block by introducing a solution when the engine is running at idle. The preset salt solution is obtained by dissolving artificial sea salt in purified water according to the average salinity of the ocean, ensuring complete dissolution. Before each use of the preset salt solution, the salinity must be measured with a salinity meter and adjusted according to standards to ensure the required salinity is achieved to simulate seawater. The preset purified solution is purified water. These points will not be repeated below.

[0049] In some specific embodiments of the present invention, obtaining the standard cleaning efficiency, standard performance benchmark, preset cleaning flow rate, and preset cleaning time of the engine body includes the following steps: Based on a cold cleaning method, the standard cleaning efficiency and standard performance benchmark of the engine body are obtained by introducing a preset pure solution into the engine body. Based on a hot cleaning method, the preset cleaning flow rate and preset cleaning time of the engine body are obtained by introducing a preset pure solution into the engine body.

[0050] Specifically, after the engine body is in a cold running state, a preset pure solution is introduced into the flow channel of the engine body for cleaning. After the cold cleaning is completed, the area of ​​the blades on the engine body that has been cleaned is measured and calculated, and the ratio of this area to the total area can be obtained, thereby obtaining the standard cleaning efficiency of the engine body. At the same time, after the above cold cleaning process, the engine is started and the performance parameters of the engine body are measured, thereby obtaining the standard performance benchmark of the engine body.

[0051] Then, after driving the engine body to idle, a preset pure solution is introduced into the flow channels of the engine body for cleaning. After the thermal cleaning is completed, the preset cleaning flow rate and preset cleaning time of the engine body can be obtained. The preset cleaning flow rate is the flow rate of the preset pure solution injected into the flow channels of the engine body through the cleaning port when the engine body is in idle state. The flow rate of the preset pure solution is a% of the inlet air flow rate of the engine body. The preset cleaning time is the duration of the injection of the preset pure solution into the flow channels of the engine body through the cleaning port when the engine body is in idle state. The duration of the injection of the preset pure solution is t minutes.

[0052] The process involves repeating the hot cleaning process described above, adjusting the preset values ​​of a and t accordingly each time the process is performed, and measuring and calculating the cleaning efficiency after each hot cleaning process. By comparing the multiple cleaning efficiencies, the optimal cleaning efficiency can be obtained, leading to the optimal preset values ​​of a and t. This allows us to determine the maximum preset cleaning flow rate and preset cleaning time that the engine body can accept.

[0053] First, it should be noted that after completing any of the above-mentioned hot cleaning processes, an endoscopic inspection of the engine block is required. Only after the inspection is completed without any abnormalities can the next hot cleaning process be performed. If the inspection reveals abnormalities such as overheating, over-revving, surge, severe scratching, or damaged parts in the engine block, the preset values ​​of 'a' and 't' for the corresponding set need to be removed to avoid affecting subsequent comparisons.

[0054] Secondly, it should be noted that before each cleaning operation, whether cold or hot, the suction and pressure surfaces of the engine blades must be completely colored. After each cleaning operation, the colored area of ​​the suction and pressure surfaces on the blades will change to varying degrees. By measuring the change in the colored area of ​​the suction and pressure surfaces, the cleaning efficiency of the corresponding suction and pressure surfaces, as well as the overall cleaning efficiency of the blades, can be calculated. Similarly, for each cleaning operation mentioned below, whether cold or hot, the suction and pressure surfaces of the engine blades must also be completely colored in order to calculate the corresponding cleaning efficiency. This will not be repeated hereafter.

[0055] Specifically, the standard cleaning efficiency is obtained using the following formula:

[0056] η 吸标 =(S 吸 -S 吸标 ) / S 吸 ;

[0057] Among them, S 吸 S is the area of ​​the suction surface on the blades of the engine body. 吸标 η represents the remaining colored area on the suction surface of the blades of the engine block after cleaning the engine block under normal conditions. 吸标 The standard cleaning efficiency is the suction surface of the blades on the engine block after cleaning the engine block under normal conditions.

[0058] η 压标 =(S 压 -S 压标 ) / S 压 ;

[0059] Among them, S 压S is the area of ​​the pressure surface on the blades of the engine body. 压标 η represents the remaining colored area on the pressure surface of the blades of the engine block after normal cleaning. 压标 The standard cleaning efficiency is the cleaning efficiency of the pressure surface on the blades of the engine block after cleaning the engine block under normal conditions.

[0060] η 标 =(S 吸 +S 压 -S 吸标 -S 压标 ) / (S 吸 +S 压 );

[0061] Where, η 标 This refers to the standard cleaning efficiency of the engine blades after cleaning the engine body under normal conditions.

[0062] Finally, it should be noted that in order to facilitate the coloring treatment of the engine blades, the stator sector assembly, compressor casing and blades of the engine body need to be modified to ensure that the corresponding blades can be directly disassembled when performing coloring treatment or measuring the coloring range, so as to facilitate the detection of cleaning effect and calculation of cleaning efficiency.

[0063] In some specific embodiments of the present invention, based on the thermal cleaning method, after introducing a preset pure solution into the engine body and obtaining the preset cleaning flow rate and preset cleaning time of the engine body, the following steps are set: obtaining the preset cleaning performance benchmark of the engine body.

[0064] Specifically, the preset cleaning performance benchmark for the engine body is the performance parameters of the engine body after completing a hot cleaning process using a preset pure solution with a preset cleaning flow rate over a preset cleaning time. To obtain the maximum acceptable preset cleaning flow rate and maximum preset cleaning time for the engine body during multiple hot cleaning processes, the corresponding engine body performance parameters need to be measured after each hot cleaning process. After determining the optimal preset values ​​for 'a' and 't', the engine body performance parameters corresponding to these optimal preset values ​​are also determined, thus obtaining the preset cleaning performance benchmark for the engine body.

[0065] In some specific embodiments of the present invention, based on a cold cleaning method, a preset cleaning flow rate, and a preset cleaning time, a preset salt solution and a preset purified solution are sequentially introduced into the engine body to obtain the cold cleaning efficiency and cold cleaning performance benchmark of the engine body blades. This includes the following steps: When the engine body is in a cold operating state, a preset salt solution and a preset purified solution are sequentially introduced into the engine body according to a preset cleaning flow rate and a preset cleaning time to obtain the cold cleaning efficiency of the engine body blades. After a preset settling time, a first cold cleaning performance benchmark of the engine body is obtained. After the engine body cools down, a preset purified solution is introduced into the engine body to clean the engine body and obtain a second cold cleaning performance benchmark of the engine body.

[0066] Specifically, after the engine body is brought to a cold running state, a preset salt solution with a preset cleaning flow rate is introduced into the engine body's flow channels during a preset cleaning time for cleaning. After this cold cleaning is completed, the ratio of the cleaned area on the engine blades to the total area is obtained by measuring and calculating the cleaned area, thus determining the engine blade cold cleaning efficiency. After a preset settling time, an endoscopic inspection of the engine body is performed. Once no abnormalities are found, the engine is started, and the engine body's performance parameters are measured to obtain a first cold cleaning performance benchmark. After the engine body cools down, it is brought to a cold running state again, and a preset pure solution is introduced into the engine body's flow channels for another cleaning operation. After this cold cleaning is completed, the engine is started, and the engine body's performance parameters are measured to obtain a second cold cleaning performance benchmark.

[0067] Furthermore, the blade cold cleaning efficiency is obtained using the following formula:

[0068] η 吸1 =(S 吸 -S 吸1 ) / S 吸 ;

[0069] Among them, S 吸 S is the area of ​​the suction surface on the blades of the engine body. 吸1 η represents the remaining colored area on the suction surface of the engine blades after cold cleaning with a pre-set salt solution. 吸1 The cold cleaning efficiency of the suction surface of the blades on the engine body after cold cleaning with a preset salt solution.

[0070] η 压标1 =(S 压 -S 压1 ) / S 压 ;

[0071] Among them, S 压S is the area of ​​the pressure surface on the blades of the engine body. 压1 η represents the remaining colored area on the pressure surface of the engine blades after cold cleaning with a pre-set salt solution. 压1 The cold cleaning efficiency of the pressure surface of the blades on the engine body after cold cleaning with a preset salt solution.

[0072] η1=(S 吸 +S 压 -S 吸1 -S 压1 ) / (S 吸 +S 压 );

[0073] Wherein, η1 is the overall blade cold cleaning efficiency of the engine body blades after cold cleaning with a preset salt solution.

[0074] In some specific embodiments of the present invention, based on a thermal cleaning method, a preset cleaning flow rate, and a preset cleaning time, a preset salt solution is introduced into the engine body to obtain the thermal cleaning efficiency and thermal cleaning performance benchmark of the engine body blades. This includes the following steps: while the engine body is in a ground idle state, a preset salt solution is introduced into the engine body according to a preset cleaning flow rate and a preset cleaning time to obtain the thermal cleaning efficiency of the engine body blades. After a preset settling time, a first thermal cleaning performance benchmark of the engine body is obtained. After the engine body cools down, a preset pure solution is introduced into the engine body to clean the engine body and obtain a third cold cleaning performance benchmark of the engine body.

[0075] Specifically, after the engine body is driven to idle, a preset salt solution with a preset cleaning flow rate is introduced into the flow channels of the engine body for cleaning within a preset cleaning time. After the hot cleaning is completed and the engine continues to run for 3 minutes before stopping, the area of ​​the blades that have been cleaned is measured and calculated, thus obtaining the ratio of the cleaned area to the total area, thereby obtaining the hot cleaning efficiency of the engine body blades. After a preset resting time, the engine body is inspected internally. If no abnormalities are found, the engine is started, and the performance parameters of the engine body are measured accordingly to obtain the first hot cleaning performance benchmark of the engine body. After the engine body cools down, it is driven to cold run, and a preset pure solution is introduced into the flow channels of the engine body for cleaning again. After this cold cleaning is completed, the engine is started, and the performance parameters of the engine body are measured accordingly to obtain the third cold cleaning performance benchmark of the engine body.

[0076] The blade thermal cleaning efficiency is obtained by the following formula:

[0077] η 吸2 =(S 吸-S 吸2 ) / S 吸 ;

[0078] Among them, S 吸 S is the area of ​​the suction surface on the blades of the engine body. 吸2 η represents the remaining colored area on the suction surface of the engine blades after hot cleaning with a pre-set salt solution. 吸2 The heat cleaning efficiency of the suction surface of the blades on the engine body after heat cleaning with a preset salt solution.

[0079] η 压2 =(S 压 -S 压2 ) / S 压 ;

[0080] Among them, S 压 S is the area of ​​the pressure surface on the blades of the engine body. 压2 η represents the remaining colored area on the pressure surface of the engine blades after hot cleaning with a pre-set salt solution. 压2 The blade thermal cleaning efficiency is the pressure surface of the blades on the engine body after thermal cleaning with a preset salt solution.

[0081] η2=(S 吸 +S 压 -S 吸2 -S 压2 ) / (S 吸 +S 压 );

[0082] Wherein, η2 is the overall blade thermal cleaning efficiency of the engine body blades after thermal cleaning with a preset salt solution.

[0083] In some specific embodiments of the present invention, the feasibility assessment results of seawater cleaning of the engine body are obtained based on standard cleaning efficiency, standard performance benchmark, cold cleaning performance benchmark, hot cleaning performance benchmark, blade cold cleaning efficiency, and blade hot cleaning efficiency. This includes the following steps: obtaining the first cold cleaning performance reduction of the engine body based on the standard performance benchmark and the first cold cleaning performance benchmark; obtaining the first cold cleaning efficiency reduction of the engine body based on the standard cleaning efficiency and the blade cold cleaning efficiency; and obtaining the first cold cleaning assessment results for the feasibility of seawater cleaning of the engine body based on the first cold cleaning performance reduction and the first cold cleaning efficiency reduction.

[0084] Specifically, after obtaining the standard performance benchmark and the first cold cleaning performance benchmark, comparing the two yields the performance reduction of the first cold cleaning. The performance reduction of the first cold cleaning is calculated using the following formula:

[0085] First cold cleaning performance reduction = (Standard performance benchmark - First cold cleaning performance benchmark) / Standard performance benchmark;

[0086] Once the standard cleaning efficiency and the blade cold cleaning efficiency are obtained, comparing the two will yield the first cold cleaning efficiency reduction, which is calculated using the following formula:

[0087] First cold cleaning efficiency reduction = (Standard cleaning efficiency - First cold cleaning efficiency) / Standard cleaning efficiency;

[0088] By comprehensively analyzing the performance reduction and efficiency reduction of the first cold cleaning, the feasibility assessment results of seawater cleaning of the engine body can be obtained.

[0089] The specific conclusions of the first cold cleaning assessment are as follows: If the performance degradation after the first cold cleaning is less than or equal to 1%, it indicates that the performance degradation caused by using seawater for cold cleaning of the engine block will not affect the operation of the engine block. However, if the performance degradation after the first cold cleaning is greater than 1%, it indicates that the performance degradation caused by using seawater for cold cleaning of the engine block will affect the operation of the engine block. Furthermore, if the efficiency degradation after the first cold cleaning is less than or equal to 3%, it indicates that the cleaning effect of using seawater for cold cleaning of the engine block meets the cleaning requirements. However, if the efficiency degradation after the first cold cleaning is greater than 3%, it indicates that the cleaning effect of using seawater for cold cleaning of the engine block does not meet the cleaning requirements.

[0090] It should be noted that the efficiency reduction of the first cold cleaning is less than or equal to 3%, and the following requirements must be met:

[0091] (η 吸标 -η 吸1 ) / η 吸标 ≤3%;

[0092] (η 压标 -η 压1 ) / η 压标 ≤3%;

[0093] (η 标 -η1) / η≤3%;

[0094] If any of the above conditions are not met, the efficiency reduction of the first cold cleaning is considered to be greater than 3%.

[0095] In some specific embodiments of the present invention, the feasibility assessment results for seawater cleaning of the engine body are obtained based on standard cleaning efficiency, standard performance benchmark, cold cleaning performance benchmark, hot cleaning performance benchmark, blade cold cleaning efficiency, and blade hot cleaning efficiency. The process further includes the following steps: obtaining the first hot cleaning performance reduction of the engine body based on the standard performance benchmark and the first hot cleaning performance benchmark; obtaining the first hot cleaning efficiency reduction of the engine body based on the standard cleaning efficiency and the blade hot cleaning efficiency; and obtaining the first hot cleaning assessment results for the feasibility of seawater cleaning of the engine body based on the first hot cleaning performance reduction and the first hot cleaning efficiency reduction.

[0096] Specifically, after obtaining the standard performance benchmark and the first thermal cleaning performance benchmark, comparing the two yields the performance reduction of the first thermal cleaning. The performance reduction of the first thermal cleaning is calculated using the following formula:

[0097] First hot cleaning performance reduction = (Standard performance benchmark - First hot cleaning performance benchmark) / Standard performance benchmark;

[0098] Once the standard cleaning efficiency and the blade thermal cleaning efficiency are obtained, comparing the two will yield the first thermal cleaning efficiency reduction, which is calculated using the following formula:

[0099] First hot cleaning efficiency reduction = (Standard cleaning efficiency - First hot cleaning efficiency) / Standard cleaning efficiency;

[0100] By comprehensively analyzing the performance degradation and efficiency degradation of the first hot cleaning, the feasibility assessment results of seawater cleaning of the engine body can be obtained.

[0101] The specific conclusions of the first hot cleaning assessment are as follows: If the performance degradation after the first hot cleaning is less than or equal to 1%, it indicates that the performance degradation caused by using seawater for hot cleaning of the engine block will not affect the operation of the engine block. However, if the performance degradation after the first hot cleaning is greater than 1%, it indicates that the performance degradation caused by using seawater for hot cleaning of the engine block will affect the operation of the engine block. Simultaneously, if the efficiency degradation after the first hot cleaning is less than or equal to 3%, it indicates that the cleaning effect of using seawater for hot cleaning of the engine block meets the cleaning requirements. However, if the efficiency degradation after the first hot cleaning is greater than 3%, it indicates that the cleaning effect of using seawater for hot cleaning of the engine block does not meet the cleaning requirements.

[0102] It should be noted that the efficiency reduction of the first hot cleaning step must be less than or equal to 3%, and the following requirements must be met:

[0103] (η 吸标 -η 吸2 ) / η 吸标 ≤3%;

[0104] (η 压标 -η 压2 ) / η 压标 ≤3%;

[0105] (η 标 -η2) / η≤3%;

[0106] If any of the above conditions are not met, the efficiency reduction of the first hot cleaning is considered to be greater than 3%.

[0107] In some specific embodiments of the present invention, after obtaining the feasibility assessment results of seawater cold cleaning of the engine body based on the first cold cleaning performance reduction and the first cold cleaning efficiency reduction, the following steps are included: obtaining the second cold cleaning performance reduction of the engine body based on a standard performance benchmark and a second cold cleaning performance benchmark; and obtaining the second cold cleaning assessment results of the feasibility of seawater cleaning of the engine body based on the second cold cleaning performance reduction.

[0108] Specifically, after obtaining the standard performance benchmark and the second cold cleaning performance benchmark, comparing the two yields the reduction in second cold cleaning performance, which is calculated using the following formula:

[0109] Second cold cleaning performance reduction = (Standard performance benchmark - Second cold cleaning performance benchmark) / Standard performance benchmark;

[0110] By comprehensively analyzing the performance degradation of the first cold cleaning and the second cold cleaning, the feasibility assessment result of seawater cleaning of the engine body can be obtained.

[0111] The specific conclusion of the second cold cleaning assessment is as follows: if the performance degradation after the first cold cleaning is greater than 1%, while the performance degradation after the second cold cleaning is less than or equal to 1%, it indicates that using seawater for cold cleaning of the engine block did not cause irreversible performance loss. Therefore, based on the specific cleaning effect, in cases of extreme freshwater scarcity due to unforeseen circumstances, a combination of seawater and purified water can be used for cold cleaning of the engine block's flow channels, as long as the final cold cleaning process uses pure water, which will meet the requirements.

[0112] In some specific embodiments of the present invention, after obtaining the feasibility assessment results of seawater thermal cleaning of the engine body based on the first thermal cleaning performance degradation and the first thermal cleaning efficiency degradation, the following steps are included: obtaining the third cold cleaning performance degradation of the engine body based on a standard performance benchmark and a third cold cleaning performance benchmark; and obtaining the third cold cleaning assessment results of the feasibility of seawater cleaning of the engine body based on the third cold cleaning performance degradation.

[0113] Specifically, after obtaining the standard performance benchmark and the third cold cleaning performance benchmark, comparing the two yields the performance reduction of the third cold cleaning. The performance reduction of the third cold cleaning is calculated using the following formula:

[0114] Third cold cleaning performance reduction = (Standard performance benchmark - Third cold cleaning performance benchmark) / Standard performance benchmark;

[0115] By comprehensively analyzing the performance degradation of the first hot cleaning and the third cold cleaning, the feasibility assessment result of the third cold cleaning of the engine body using seawater can be obtained.

[0116] The specific conclusion of the third cold cleaning assessment is as follows: if the performance degradation after the first hot cleaning is greater than 1%, while the performance degradation after the third cold cleaning is less than or equal to 1%, it indicates that using seawater for hot cleaning of the engine block did not cause irreversible performance loss. However, because hot cleaning and cold cleaning methods should not be used alternately in a short period of time, the ability to use seawater for hot cleaning of the engine block's flow channels is not feasible to prevent damage to components.

[0117] In some specific embodiments of the present invention, after obtaining the preset cleaning performance benchmark of the engine body, the following steps are set: based on the standard performance benchmark and the preset cleaning performance benchmark, a second thermal cleaning evaluation result of the feasibility of cleaning the engine body with seawater is obtained.

[0118] Specifically, after obtaining the standard performance benchmark and the preset cleaning performance benchmark, the two are compared to obtain the second thermal cleaning performance reduction, which is obtained by the following formula:

[0119] Second thermal cleaning performance reduction = (standard performance benchmark - preset cleaning performance benchmark) / standard performance benchmark;

[0120] By analyzing the performance degradation of the second thermal cleaning, the feasibility assessment results of the second thermal cleaning method for cleaning the engine body with seawater can be obtained.

[0121] The specific conclusion of the second hot cleaning assessment is as follows: if the performance reduction of the second hot cleaning is greater than 1%, it indicates that using seawater to perform hot cleaning on the engine body has caused irreversible performance loss, and the engine body does not have the ability to use seawater to perform hot cleaning on the flow channels.

[0122] It should be noted that throughout the evaluation process, the engine body needs to be continuously observed during each cleaning operation. If obvious phenomena such as overheating, over-speeding, surge, severe scraping, or damage to parts occur in the engine, it indicates that using seawater to clean the engine body in the corresponding cleaning operation is not safe.

[0123] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A feasibility assessment method for seawater cleaning of an engine, characterized in that, Includes the following steps: Obtain the standard cleaning efficiency, standard performance benchmark, preset cleaning flow rate, and preset cleaning time of the engine body; The standard cleaning efficiency is the ratio of the cleaned area of ​​the blades to the total area of ​​the engine body after cleaning the engine body under normal conditions. The standard performance benchmark is the performance parameters of the engine body after cleaning the engine body under normal conditions. Based on the cold cleaning method, preset cleaning flow rate and preset cleaning time, a preset salt solution and a preset pure solution are sequentially introduced into the engine body to obtain the cold cleaning efficiency and cold cleaning performance benchmark of the engine body blades. When the engine body is in a cold operating state, a preset salt solution is introduced into the engine body according to the preset cleaning flow rate and preset cleaning time to obtain the cold cleaning efficiency of the engine body blades. After a preset settling time, an endoscopic inspection of the engine body is performed. Once no abnormalities are found, the first cold cleaning performance benchmark of the engine body is obtained. After the engine body cools down, a pre-set pure solution is introduced into the engine body to clean the engine body and obtain the second cold cleaning performance benchmark of the engine body. Based on the hot cleaning method, preset cleaning flow rate and preset cleaning time, a preset salt solution and a preset pure solution are sequentially introduced into the engine body to obtain the hot cleaning efficiency and hot cleaning performance benchmark of the engine body blades. When the engine body is in a ground idle state, a preset salt solution is introduced into the engine body according to the preset cleaning flow rate and preset cleaning time to obtain the engine body blade thermal cleaning efficiency. After a preset settling time, an endoscopic inspection of the engine body is performed. Once no abnormalities are found, the first thermal cleaning performance benchmark of the engine body is obtained. After the engine block cools down, a pre-set pure solution is introduced into the engine block to clean it and obtain the third cold cleaning performance benchmark of the engine block. Based on standard cleaning efficiency, standard performance benchmark, cold cleaning performance benchmark, hot cleaning performance benchmark, blade cold cleaning efficiency, and blade hot cleaning efficiency, the feasibility assessment results of seawater cleaning of the engine body are obtained. include: Obtain the first cold cleaning performance reduction and the first cold cleaning efficiency reduction of the engine body; First cold cleaning performance reduction = (Standard performance benchmark - First cold cleaning performance benchmark) / Standard performance benchmark; First cold cleaning efficiency reduction = (Standard cleaning efficiency - First cold cleaning efficiency) / Standard cleaning efficiency; If the performance degradation of the first cold cleaning is less than or equal to 1%, it means that the performance degradation caused by using seawater to cold clean the engine body will not affect the operation of the engine body. At the same time, if the efficiency degradation of the first cold cleaning is less than or equal to 3%, it means that the cleaning effect of using seawater to cold clean the engine body can meet the cleaning requirements. Obtain the first thermal cleaning performance reduction and the first thermal cleaning efficiency reduction of the engine body; First hot cleaning performance reduction = (Standard performance benchmark - First hot cleaning performance benchmark) / Standard performance benchmark; First hot cleaning efficiency reduction = (Standard cleaning efficiency - First hot cleaning efficiency) / Standard cleaning efficiency; If the performance degradation of the first hot cleaning is less than or equal to 1%, it means that the performance degradation caused by using seawater to hot clean the engine body will not affect the operation of the engine body. At the same time, if the efficiency degradation of the first hot cleaning is less than or equal to 3%, it means that the cleaning effect of using seawater to hot clean the engine body can meet the cleaning requirements.

2. The feasibility assessment method for seawater cleaning of an engine according to claim 1, characterized in that, The process of obtaining the standard cleaning efficiency, standard performance benchmark, preset cleaning flow rate, and preset cleaning time of the engine body includes the following steps: Based on the cold cleaning method, a preset pure solution is introduced into the engine body to obtain the standard cleaning efficiency and standard performance benchmark of the engine body; Based on the thermal cleaning method, a preset pure solution is introduced into the engine body to obtain the preset cleaning flow rate and preset cleaning time of the engine body.

3. The feasibility assessment method for seawater cleaning engines according to claim 2, characterized in that, The heat-based cleaning method involves introducing a preset pure solution into the engine body, obtaining a preset cleaning flow rate and a preset cleaning time for the engine body, and then implementing the following steps: Obtain the preset cleaning performance benchmark of the engine body.

4. The feasibility assessment method for seawater cleaning of an engine according to claim 1, characterized in that, After obtaining the feasibility assessment results of the seawater cold cleaning engine body based on the first cold cleaning performance reduction and the first cold cleaning efficiency reduction, the following steps are set: Based on the standard performance benchmark and the second cold cleaning performance benchmark, the second cold cleaning performance reduction of the engine body is obtained; Based on the performance degradation of the second cold cleaning, the feasibility assessment results of seawater cleaning of the engine body were obtained.

5. The feasibility assessment method for seawater cleaning of an engine according to claim 1, characterized in that, After obtaining the feasibility assessment results of the seawater thermal cleaning engine body based on the first thermal cleaning performance reduction and the first thermal cleaning efficiency reduction, the following steps are set: Based on the standard performance benchmark and the third cold cleaning performance benchmark, the reduction in the third cold cleaning performance of the engine body is obtained; Based on the performance degradation of the third cold cleaning, the feasibility assessment results of seawater cleaning of the engine body were obtained.

6. The feasibility assessment method for seawater cleaning of an engine according to claim 3, characterized in that, After obtaining the preset cleaning performance benchmark of the engine body, the following steps are set: Based on standard performance benchmarks and preset cleaning performance benchmarks, a second thermal cleaning assessment result was obtained to determine the feasibility of cleaning the engine body with seawater.

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